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Cytokinesis-the actual process of cell division-has attracted theorists for well over 100 years. It has been said that all possible explanations of cytokinesis have been proposed; the problem is to decide which one is correct.
Consider the following three hypotheses:
1. Chromosome signaling: When chromosomes split at anaphase, they emit a signal to the nearby cell surface to initiatefurrowing.2. Polar relaxation: Asters relax the tension in the region of the cell surface nearest the spindle poles (the polar region),allowing the region of the membrane farthest from the poles (the equatorial plane) to contract and initiate furrowing.3. Aster stimulation: The asters stimulate contraction in the region of the cell surface where oppositely oriented spindle fibersoverlap (that is, the equatorial region), thereby initiating furrowing.These hypotheses have been tested in a number of ways, One particularly informative experiment involved pressing a glass ballonto the center of a dividing sand dollar egg so as to deform it into a torus (donut shape). As illustrated in Figure 17-35, the eggdivided into a single sausage-shaped cell at the first division; at the second division, it divided into four cells.A. What does the chromosome-signaling hypothesis predict for the result of this experiment? Do the predictions match the experimental observations?
B. What does the polar-relaxation hypothesis predict for the experimental out-come? Do the predictions match the experimental observations?
C. What does the aster-stimulation hypothesis predict? Do the predictions match the experimental observations?
Suppose that you are member of a marine biology team seeking to catalogue the organisms inhabiting a threatened coral reef. The team has found two new seaweeds,
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It is Known that the Pentuple ACS Mutant is known to show greater suspectibility to pathogens, ACS is also responsible forACC to ethylene conversion.
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In andelusian chickens, the color of the feathers is cocominant. The extremes are black and white with mixed alleles creating blue. If the chickens are dominant for a long spur and recessive for a short spur, what are the genotypes and phenotypes ..
How would the plan clearly explain the concept of infectious diseases and how it progresses?
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Erythropoetin is available as a pharmacological drug treatment. Recently a well-known cyclist was accused of using erythropoietin.
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